Improvement in dies for capping screws



G. W. BRIGGS.

Dies for Capping Screws.

NO. 134,845. PatentedJan-14J873.

' TER @Hummm use, and at the same time less expensive in UNIED TATES GEORGE W. BRIGGS, OF NEW HAVEN, CONNECTICUT.

YINIPROVElilE-INT IN DIES FOR CAPPING SCREWS.

Specification forming part of Letters Patent No 134,45, dated January 14, 1873.

To all uhom it may concern.-

Be it known that I, GEORGE W. Baisers, of New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Dies for Capping Screws, of which the following is a specilication:

Figure 1 is a detail sectional View of rnyimproved die taken through the line a: m, Fig. 2. Fig. 2 is a detail sectional view of the saine taken through the line y y, Fig. 1. Fig. 3 is a top view of the same. Fig. 4 is a side View of capped screw, the cap being shown in section. Fig. 5 is aperspective view of one of the caps.

Similar letters ot' reference indicate correspondin g parts.

My invention has for its object to furnish an improved die for capping screws, which shall be simple in construction and convenient in manufacture and less liable to get out of order than the dies constructed in the ordinary manner 5 and it consists in the circle piece or guide, in combination with the rest, spring, and slotted and recessed die, as hereinafter more fully described.

A represents the bed-piece, which is constructed and secured to the bed-plate of the machine in the ordinary manner. The bedpiece A is made with an inwardlyprojecting iiange at its lower end to support the rest or stand B. The restB has a hole. through it for the passage of the stem or holder C,the upper part of said hole being enlarged or deeply countersunk to receive the coiled spring D, the lowerend of which rests upon the shoulder thus formed, and upon its upper end rests the head of the stem C. The upper end or top of the stem or holder C is concaved to receive and give a wide bearing to the edge of the guide or circle piece E, which is made in the form of a circular or ring disk, of such a thickness that it may enter the slot of the screw-head. The guide E enters a slot in the rest B, and rests upon the stem or holder C. F is the die, in the center of the top of which is formed a concavity of such a size as to receive the head of the screw. In the lower side of the die F is formed a slot to receive the upper part of the circle piece E, said slot extending into the cavity in the top of said die, so that the upper edge of said center piece may eX- tend into said cavity to enter the slot in the screw-head. The die F is secured in the bedpiece A by a set-screw, G, as shown in Figs. l and 3. i

In using the die the cap H is placed in the cavity of die F in such a position that the circle piece E may enter the slot `in said cap. The screw is then placed in the cap H, with the slot in its head upon the guide E, thus making the slots in the cap and screw-heads exactly coincide. The movable die then de scends and closes the edge of the cap down upon the screw-head, as shown in Fig. 4.

By this construction, should the edge of the circle piece be battered or worn, it may be turned, and should the slot in the screw-head not be exactly true the said circle piece can adjust itself to said slot. By this construc tion, also, the spring D will allow the guide or lcircle piece E to yield `and be forced down into the rest B should the slot in the screwhead` be shallow, or otherwise defective or wanting, so that no part ofthe die need be broken.

Having thus described my invention, Iclaim as'rnew and desire to secure by Letters Patent- 1. The circle piece or guide E, in combination with the rest B, stem C, spring D, and slotted and recessed die F, substantially as herein shown and described, and for the purpose set forth.

2. The concavity formed in the head of the stem or holder C to give a wide bearing to the edge of the circle piece or guide E, substantially as herein shown and described.

GEORGE W. BRIGGS.

Witnesses:

D. R. WRIGHT, LUGIEN W. SPERRY. 

